Fan casing with air flow rib structure



FIG. 1 is a perspective view of a fan casing with air flow rib structure, in accordance with the present invention;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plane view thereof;

FIG. 8 is a cross-sectional view taken along the line 8—8 in FIG. 3;

FIG. 9 is a cross-sectional view taken along the line 9—9 in FIG. 3; and,

FIG. 10 is an enlarged cross-sectional view taken along the line 10—10 in FIG. 3. 

The ornamental design for a fan casing with air flow rib structure, as shown and described. 